feat(#532): add process.list + process.kill manager screen (#556)

Co-authored-by: M57 <m57@hermes-control.app>

app/src/main/java/com/m57/hermescontrol/data/model/ProcessInfo.kt

@@ -0,0 +1,50 @@
+package com.m57.hermescontrol.data.model
+
+/**
+ * A single background process owned by a session, as returned by the gateway
+ * `process.list` RPC.
+ *
+ * Field names match the gateway JSON exactly (Gson deserializes by name,
+ * snake_case). See `tui_gateway/server.py::_session_processes` and
+ * `tools/process_registry.list_sessions` for the canonical shape.
+ *
+ * @property sessionId Stable process id used by `process.kill` as `process_id`.
+ * @property command First 200 chars of the spawned command line.
+ * @property cwd Working directory the process was launched in.
+ * @property pid OS process id (0 / null for detached or not-yet-spawned).
+ * @property startedAt ISO-8601 local timestamp string from the backend.
+ * @property uptimeSeconds Seconds since spawn (backend-computed).
+ * @property status `"running"` or `"exited"`.
+ * @property outputPreview Last 200 chars of buffered output.
+ * @property outputTail Last 4000 chars of buffered output (richer preview).
+ * @property exitCode Present only when [status] == `"exited"`.
+ * @property sessionScoped True when surfaced only because it shares the gateway
+ *   session (not the current task) — a possibly-forgotten long-lived process.
+ */
+data class ProcessInfo(
+    val sessionId: String,
+    val command: String? = null,
+    val cwd: String? = null,
+    val pid: Int? = null,
+    val startedAt: String? = null,
+    val uptimeSeconds: Int? = null,
+    val status: String? = null,
+    val outputPreview: String? = null,
+    val outputTail: String? = null,
+    val exitCode: Int? = null,
+    val sessionScoped: Boolean = false,
+) {
+    val isRunning: Boolean get() = status != "exited"
+
+    /** A short, human-readable title derived from the command line. */
+    val title: String
+        get() =
+            (command ?: "")
+                .lineSequence()
+                .firstOrNull()
+                ?.trim()
+                .orEmpty()
+                .ifEmpty { "background process" }
+
+    companion object
+}